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Another arson attack and another burnt-to-a-crisp corpse: no wonder Banks (Stephen Tompkinson) is looking anguished. To make matters worse, his boss tells him that Dr Aspern (John Bowe) is threatening to report him for that face-slapping incident. Banks’s sidekick, DS Annie Cabbot (Andrea Lowe), however, is in much brighter spirits because she’s in bed with charming art expert Mark.

Halfway through this absorbing concluding episode you’ll probably get wind of a suspect, but the back story of Aspern and his child bride (a rivetingly creepy performance from Tamzin Merchant) has a twist not many viewers will spot.

About this programme

2/6. Part two of two. When Tom McMahon becomes the third victim of a spate of suspicious fires, Banks realises he is now on the trail of a serial killer. A new discovery about the methods used by the murderer casts doubt on the alibis of all his suspects and the detective is determined to get to the truth at the Asperns' house - despite being warned by his superiors to stay away from the family. Stephen Tompkinson stars.